:root{
  --paper:#F5F4EF;--card:#FFFFFF;--ink:#141B22;--ink2:#4A5560;--mute:#8A939C;--line:#E6E3DA;--line2:#D6D2C6;
  --blue:#2563EB;--blueink:#1D4ED8;--bluebg:#EAF0FE;--amber:#D97706;--amberbg:#FFF4E3;--teal:#1D9E75;--coral:#D85A30;
  --serif:"Noto Serif CJK SC","Source Han Serif SC","Songti SC","STSong","SimSun",serif;
  --sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
  --nav:236px;
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
.app{display:grid;grid-template-columns:var(--nav) minmax(0,1fr);min-height:100vh}
/* 左侧目录 */
.nav{position:sticky;top:0;height:100vh;overflow:auto;border-right:1px solid var(--line);padding:26px 18px 30px;background:var(--paper)}
.brand{display:block;padding:0 8px 18px;border-bottom:1px solid var(--line);margin-bottom:14px}
.brand b{display:block;font-family:var(--serif);font-size:20px;font-weight:600;letter-spacing:.02em;line-height:1.3}
.brand span{display:block;font-size:12px;color:var(--mute);margin-top:4px;letter-spacing:.06em}
.site-links{border-bottom:1px solid var(--line);padding-bottom:15px;margin-bottom:18px;display:grid;gap:4px}
.author-footer{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.author-footer a:hover{color:var(--blueink);text-decoration:underline;text-underline-offset:3px}
.sec{margin:14px 0 6px;padding:0 8px;font-size:12px;color:var(--mute);letter-spacing:.14em}
.sec em{font-style:normal;margin-left:6px;color:var(--line2)}
.nav .item{display:flex;align-items:center;gap:8px;padding:6px 8px 6px 12px;border-radius:8px;font-size:14.5px;color:var(--ink2);position:relative;line-height:1.35}
.nav a.item:hover{background:#ECEAE2;color:var(--ink)}
.nav a.item.on{color:var(--blueink);background:var(--bluebg);font-weight:600}
.nav a.item.on::before{content:"";position:absolute;left:0;top:7px;bottom:7px;width:3px;border-radius:2px;background:var(--blue)}
.nav .item.soon{color:var(--mute);cursor:default;font-size:13.5px;padding-top:4px;padding-bottom:4px}
.nav .item.soon:hover{background:none;color:var(--mute)}
.nav .item.soon i{font-style:normal;font-size:10px;border:1px solid var(--line2);border-radius:999px;padding:0 6px;margin-left:auto;letter-spacing:.05em}
.topbar{display:none}
/* 主区 */
main{padding:34px 44px 40px;max-width:1240px}
.ph{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:20px;animation:up .5s .02s both}
.ph h1{font-family:var(--serif);font-size:38px;font-weight:600;margin:0;line-height:1.2;letter-spacing:.01em}
.ph .one{margin:8px 0 0;font-size:17px;color:var(--blueink)}
.pn{display:flex;gap:8px;flex-shrink:0;padding-bottom:6px}
.pn a{display:inline-flex;align-items:center;gap:6px;padding:7px 14px;border:1px solid var(--line2);border-radius:999px;font-size:13.5px;color:var(--ink2);background:var(--card)}
.pn a:hover{border-color:var(--blue);color:var(--blueink)}
.pn a.off{opacity:.35;pointer-events:none}
/* 舞台：图 + 控制台 */
.stage{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:16px;align-items:start;animation:up .5s .1s both}
.fig{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:14px 14px 12px}
.fig canvas{display:block;width:100%;border-radius:10px;background:#fff;touch-action:none}
.fig canvas + canvas{margin-top:12px;border-top:1px solid var(--line);border-radius:0 0 10px 10px;padding-top:10px}
.cap{display:flex;gap:12px;align-items:flex-start;margin-top:12px;padding:10px 12px;border-radius:10px;background:var(--paper);font-size:15px;line-height:1.55;min-height:46px}
.cap b{flex-shrink:0;font-size:12px;color:var(--blueink);border:1px solid var(--blue);border-radius:999px;padding:1px 8px;margin-top:2px;letter-spacing:.08em}
.legend{display:flex;gap:14px;flex-wrap:wrap;font-size:12.5px;color:var(--ink2);margin:10px 4px 0}
.legend i{display:inline-block;width:10px;height:10px;border-radius:50%;margin-right:5px;vertical-align:-1px}
.legend i.sq{border-radius:2px}
.panel{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px 16px 12px;display:flex;flex-direction:column;gap:14px}
.ctl{display:flex;flex-direction:column;gap:5px}
.ctl .lab{display:flex;justify-content:space-between;align-items:baseline;font-size:13px;color:var(--ink2)}
.ctl .lab .val{font-size:17px;font-weight:600;color:var(--ink);font-variant-numeric:tabular-nums}
.ctl input[type=range]{width:100%;margin:0;accent-color:var(--blue)}
.ctl.row{flex-direction:row;align-items:center;gap:9px;font-size:14px}
.ctl.row input[type=checkbox]{width:17px;height:17px;margin:0;accent-color:var(--blue)}
select{font:inherit;font-size:14px;padding:6px 8px;border:1px solid var(--line2);border-radius:8px;background:#fff;color:var(--ink);width:100%}
button{font:inherit;font-size:14.5px;padding:9px 14px;border:1px solid var(--blue);border-radius:10px;background:#fff;color:var(--blueink);cursor:pointer;transition:background .15s,transform .1s}
button:hover{background:var(--bluebg)}
button:active{transform:scale(.98)}
button.primary{background:var(--blue);color:#fff}
button.primary:hover{background:var(--blueink)}
button:disabled{opacity:.4;cursor:default}
.btns{display:flex;flex-direction:column;gap:8px}
.btns.h{flex-direction:row}
.btns.h button{flex:1;padding:8px 6px}
.stats{border-top:1px solid var(--line);padding-top:10px;display:flex;flex-direction:column;gap:8px}
.stat{display:flex;justify-content:space-between;align-items:baseline;gap:8px;font-size:13px;color:var(--ink2)}
.stat .v{font-size:19px;font-weight:600;color:var(--ink);font-variant-numeric:tabular-nums;text-align:right;line-height:1.3}
/* 说明：短句 */
.notes{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:16px;animation:up .5s .18s both}
.note{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px 20px}
.note h2{font-size:13px;color:var(--mute);letter-spacing:.14em;margin:0 0 10px;font-weight:600}
.note h2::before{content:"";display:inline-block;width:9px;height:9px;border-radius:2px;background:var(--blue);margin-right:8px;vertical-align:0}
.note.warn h2::before{background:var(--amber)}
.note ol,.note ul{margin:0;padding:0;list-style:none}
.note li{display:flex;gap:10px;padding:6px 0;font-size:15px;line-height:1.5;border-top:1px solid var(--line)}
.note li:first-child{border-top:0}
.note ol li::before{counter-increment:n;content:counter(n);flex-shrink:0;width:22px;height:22px;border-radius:50%;background:var(--blue);color:#fff;font-size:12px;font-weight:600;display:flex;align-items:center;justify-content:center;margin-top:2px}
.note ol{counter-reset:n}
.note ul li::before{content:"";flex-shrink:0;width:8px;height:8px;border-radius:50%;background:var(--amber);margin-top:9px}
.note li span{color:var(--ink2)}.note li b{font-weight:600;margin-right:6px;color:var(--ink)}
.quote{margin:18px 0 0;padding:14px 22px;border-left:3px solid var(--blue);font-family:var(--serif);font-size:20px;line-height:1.55;color:var(--ink);animation:up .5s .26s both}
footer{margin-top:34px;font-size:12.5px;color:var(--mute)}
/* 首页 */
.hero{padding:10px 0 26px;border-bottom:1px solid var(--line);margin-bottom:6px;animation:up .5s both}
.hero h1{font-family:var(--serif);font-size:44px;font-weight:600;margin:0 0 10px;line-height:1.15}
.hero p{margin:0;font-size:17px;color:var(--ink2);max-width:640px}
.hero p b{color:var(--blueink);font-weight:600}
.gsec{margin-top:30px;animation:up .5s .1s both}
.gsec h2{font-family:var(--serif);font-size:24px;font-weight:600;margin:0 0 4px}
.gsec .sub{font-size:14px;color:var(--mute);margin:0 0 14px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(232px,1fr));gap:14px}
.gcard{display:flex;gap:12px;align-items:flex-start;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px 14px 12px;transition:border-color .15s,transform .15s}
.gcard:hover{border-color:var(--blue);transform:translateY(-2px)}
.gcard.soon{background:transparent;border-style:dashed;color:var(--mute)}
.gcard.soon:hover{border-color:var(--line2);transform:none}
.gcard .ic{width:46px;height:46px;flex-shrink:0;border-radius:10px;background:var(--bluebg);color:var(--blueink);display:flex;align-items:center;justify-content:center}
.gcard.soon .ic{background:#ECEAE2;color:var(--mute)}
.gcard .ic svg{width:30px;height:30px}
.gcard .t{font-size:16px;font-weight:600;margin:1px 0 2px;line-height:1.3}
.gcard .d{font-size:13px;color:var(--ink2);margin:0;line-height:1.45}
.gcard.soon .d{color:var(--mute)}
.gcard .tag{font-size:10px;border:1px solid var(--line2);border-radius:999px;padding:0 6px;margin-left:6px;vertical-align:2px;letter-spacing:.05em}
@keyframes up{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
@media (max-width:1000px){.stage{grid-template-columns:1fr}.panel{flex-direction:row;flex-wrap:wrap;align-items:flex-end}.panel .ctl{min-width:170px;flex:1}.panel .btns{flex-direction:row}.stats{flex-direction:row;flex-wrap:wrap;width:100%;gap:18px}.notes{grid-template-columns:1fr}}
@media (max-width:820px){
  .app{grid-template-columns:1fr}
  .nav{position:fixed;left:0;top:0;bottom:0;width:min(84vw,300px);z-index:20;transform:translateX(-102%);transition:transform .25s;box-shadow:0 0 0 100vw rgba(0,0,0,0)}
  .nav.open{transform:none;box-shadow:0 0 0 100vw rgba(20,27,34,.35)}
  .topbar{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--line);background:var(--paper);position:sticky;top:0;z-index:10}
  .topbar b{font-family:var(--serif);font-size:16px}
  .topbar button{padding:6px 12px;font-size:13px}
  main{padding:18px 16px 30px}
  .ph{flex-direction:column;align-items:flex-start;gap:10px}.ph h1{font-size:30px}.hero h1{font-size:32px}
  .panel{flex-direction:column;align-items:stretch}.stats{flex-direction:column}
}

/* 三维页的全屏 */
.fig{position:relative}
.fstools{position:absolute;top:22px;right:22px;display:flex;gap:6px;z-index:5}
.fstools button{padding:5px 11px;font-size:13px;border-radius:999px;background:rgba(255,255,255,.92);border:1px solid var(--line2);color:var(--ink2)}
.fstools button:hover{border-color:var(--blue);color:var(--blueink);background:#fff}
.fstools button.zoom{display:none;min-width:38px}
.fig.fs{background:#fff;padding:18px 26px 12px;display:flex;flex-direction:column;width:100vw;height:100vh;border:0;border-radius:0}
.fig.fs .fstools{top:14px;right:18px}
.fig.fs .fstools button.zoom{display:inline-block}
.fig.fs canvas:not(#cv3){display:none}
.fig.fs .legend{display:none}
.fig.fs .cap{margin-top:10px;font-size:17px;flex-shrink:0}
.fig.fs canvas#cv3{flex:0 0 auto}

/* 神经网络游乐场 */
.acts{display:flex;flex-wrap:wrap;gap:6px;margin:0 0 10px}
.acts button{font-size:13px;padding:5px 11px;border-radius:999px;border:1px solid var(--line2);color:var(--ink2);background:#fff}
.acts button:hover{border-color:var(--blue);color:var(--blueink);background:#fff}
.acts button.on{background:var(--blue);border-color:var(--blue);color:#fff}
.row2{display:flex;gap:12px;margin-top:12px}
.row2 canvas{flex:1;min-width:0}
.fig .row2 canvas{border:1px solid var(--line);border-radius:10px;padding:0;margin-top:0}
.arch{display:flex;align-items:center;gap:6px;font-size:13px;color:var(--ink2);margin:2px 0}
.arch b{min-width:1.4em;text-align:center;color:var(--ink);font-size:15px}
.arch button{padding:0 9px;font-size:15px;line-height:24px;border-radius:6px}
.arch .l{flex:1}
.feats{display:flex;flex-wrap:wrap;gap:4px 10px;font-size:13px}
.feats label{display:flex;align-items:center;gap:4px}
.feats input{width:15px;height:15px;margin:0;accent-color:var(--blue)}
.grp{font-size:11px;letter-spacing:.14em;color:var(--mute);margin:4px 0 -6px}
@media (max-width:820px){.row2{flex-direction:column}}

.acts.top{margin:0 0 14px}
.acts.top button{font-size:13.5px;padding:6px 13px}
.acts.top button i{font-style:normal;display:inline-block;width:18px;height:18px;line-height:18px;border-radius:50%;background:var(--bluebg);color:var(--blueink);font-size:11px;text-align:center;margin-right:6px;font-weight:600}
.acts.top button.on i{background:#fff;color:var(--blueink)}
.toolbar{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;margin:0 0 10px;padding:8px 10px;background:var(--paper);border-radius:10px}
.toolbar .tb{display:flex;gap:6px}
.toolbar .tb button{padding:6px 12px;font-size:13.5px;border-radius:8px}
.kpis{display:flex;gap:16px;font-size:13px;color:var(--ink2);align-items:baseline}
.kpis b{font-size:17px;color:var(--ink);font-variant-numeric:tabular-nums;margin-left:4px}
.kpis .tr b{color:var(--blueink)}.kpis .te b{color:var(--coral)}
.actcap{display:flex;gap:12px;align-items:flex-start;margin-top:12px;padding:10px 12px;border-radius:10px;background:var(--bluebg);font-size:15px;line-height:1.55}
.actcap b{flex-shrink:0;font-size:12px;color:#fff;background:var(--blue);border-radius:999px;padding:1px 8px;margin-top:3px;letter-spacing:.08em}
.fig canvas.net{cursor:default}

/* 优化器赛跑：排行榜 */
.board{display:flex;flex-direction:column;gap:2px;border-top:1px solid var(--line);padding-top:10px}
.board .bh{font-size:12px;color:var(--mute);letter-spacing:.12em;margin-bottom:4px;display:flex;justify-content:space-between}
.brow{display:grid;grid-template-columns:14px 11px 1fr auto;column-gap:7px;row-gap:1px;align-items:center;font-size:13px;color:var(--ink2);padding:4px 6px;border-radius:8px;line-height:1.3;cursor:pointer;user-select:none}
.brow:hover{background:#F3F1EA}
.brow.off{opacity:.38}
.brow.win{background:var(--bluebg)}
.brow input{width:14px;height:14px;margin:0;accent-color:var(--blue);flex-shrink:0}
.brow i{width:11px;height:11px;border-radius:50%;flex-shrink:0;box-shadow:0 0 0 1.5px #fff,0 0 0 2.5px rgba(15,27,42,.18)}
.brow b{color:var(--ink);font-weight:600;white-space:nowrap}
.brow .st{grid-column:3/5;font-size:12px;line-height:1.25}
.brow .v{font-variant-numeric:tabular-nums;color:var(--ink);font-weight:600;min-width:38px;text-align:right}
@media (max-width:1000px){.board{width:100%}}
/* 优化器赛跑：六种走法一栏两列 */
.note.wide{grid-column:1/-1}
.note.wide ul{display:grid;grid-template-columns:1fr 1fr;gap:0 28px}
.note.wide li:nth-child(2){border-top:0}
.note.wide li b i{display:inline-block;width:10px;height:10px;border-radius:50%;margin-right:6px;vertical-align:-1px;box-shadow:0 0 0 1.5px #fff,0 0 0 2.5px rgba(15,27,42,.18)}
@media (max-width:820px){.note.wide ul{grid-template-columns:1fr}.note.wide li:nth-child(2){border-top:1px solid var(--line)}}

/* 面板里的键值信息、字表小格、预测表 */
.kv{display:grid;grid-template-columns:max-content 1fr;gap:6px 12px;font-size:13px;border-top:1px solid var(--line);padding-top:10px;align-items:baseline;line-height:1.45}
.kv b{font-weight:600;color:var(--ink);white-space:nowrap}
.kv span{color:var(--ink2)}
.chips{display:flex;flex-wrap:wrap;gap:3px;margin-top:6px;max-height:118px;overflow:auto;padding-right:2px}
.chips i{font-style:normal;font-size:13px;line-height:22px;width:22px;text-align:center;border:1px solid var(--line);border-radius:5px;background:#fff;color:var(--ink2)}
.predtab{display:grid;grid-template-columns:max-content 1fr;gap:5px 8px;font-size:12.5px;margin-top:8px;align-items:center}
.predtab b{font-weight:600;color:var(--ink2);white-space:nowrap}
.predtab .bar{display:flex;gap:4px;flex-wrap:wrap}
.predtab .bar i{font-style:normal;display:inline-block;padding:0 6px;border-radius:5px;background:var(--soft);color:var(--ink2);font-size:12px;line-height:20px}
.predtab .bar i:first-child{background:var(--bluebg);color:var(--blueink);font-weight:600}
.btns.h button{white-space:nowrap}
details summary{font-size:12.5px;color:var(--mute);cursor:pointer;user-select:none}

/* 三维画布内的图例与进度条 */
.hud3d{position:absolute;pointer-events:none;z-index:4;display:flex;flex-direction:column;justify-content:space-between;font-family:var(--sans)}
.hud3d .hl{display:flex;gap:12px;flex-wrap:wrap;font-size:12px;color:#B6C0D8;padding:6px 10px;background:rgba(10,16,32,.55);border:1px solid rgba(255,255,255,.08);border-radius:8px;align-self:flex-start;backdrop-filter:blur(4px)}
.hud3d .hl i{display:inline-block;width:9px;height:9px;border-radius:2px;margin-right:5px;vertical-align:-1px}
.hud3d .hl b{font-weight:500;color:#8B97B5}
.hud3d .hp{pointer-events:auto;background:rgba(10,16,32,.62);border:1px solid rgba(255,255,255,.08);border-radius:10px;padding:8px 10px 7px;backdrop-filter:blur(4px)}
.hud3d .segs{display:flex;gap:4px}
.hud3d .seg{--f:0%;position:relative;flex:1;font-size:12px;color:#8B97B5;text-align:center;padding:5px 4px 6px;border-radius:6px;background:#141D33;cursor:pointer;overflow:hidden;white-space:nowrap;transition:color .2s}
.hud3d .seg::before{content:"";position:absolute;left:0;top:0;bottom:0;width:var(--f);background:rgba(34,211,238,.28);transition:width .25s}
.hud3d .seg.on{color:#E8ECF5;box-shadow:inset 0 0 0 1px #22D3EE}
.hud3d .seg.done{color:#7DE7F5}
.hud3d .seg:hover{color:#fff}
.hud3d .cur{font-size:12.5px;color:#E8ECF5;margin-top:6px;text-align:center}
.fig.fs .hud3d .hl{font-size:14px}.fig.fs .hud3d .seg{font-size:14px;padding:8px 6px}.fig.fs .hud3d .cur{font-size:15px}

.thumbs{display:grid;grid-template-columns:repeat(4,1fr);gap:6px}
.thumbs button{padding:0;border:2px solid transparent;border-radius:8px;overflow:hidden;background:none;aspect-ratio:1}
.thumbs button img{display:block;width:100%;height:100%;object-fit:cover}
.thumbs button.on{border-color:var(--blue)}
.thumbs button span{display:block;font-size:11px;line-height:1.2;padding:2px 0;color:var(--ink2)}

.hud3d .top{display:flex;flex-direction:column;gap:8px;align-items:flex-start;min-height:0}
.hud3d .stab{pointer-events:auto;width:244px;display:flex;flex-direction:column;background:rgba(10,16,32,.72);border:1px solid rgba(255,255,255,.09);border-radius:10px;backdrop-filter:blur(4px);overflow:hidden}
.hud3d .sh{display:grid;grid-template-columns:1fr auto;gap:0 6px;padding:6px 10px 5px;font-size:12.5px;font-weight:600;color:#E8ECF5;cursor:pointer;border-bottom:1px solid rgba(255,255,255,.08)}
.hud3d .sh u{text-decoration:none}
.hud3d .sh i{grid-column:1;font-style:normal;font-size:10.5px;font-weight:400;color:#7E8BA8}
.hud3d .sh b{grid-column:2;grid-row:1/3;align-self:center;font-weight:600;color:#8B97B5;font-size:14px}
.hud3d .sb{overflow:auto;max-height:min(50vh,320px);padding:4px 0 5px}
.hud3d .stab.off .sb{display:none}
.hud3d .sr{display:flex;gap:8px;align-items:baseline;padding:1px 10px;font-size:11.5px;color:#A9B6D4;line-height:1.36}
.hud3d .sr span{flex:1;min-width:0}
.hud3d .sr i{font-style:normal;font-size:10.5px;color:#6E7C9C;white-space:nowrap}
.hud3d .sr.hd span{color:#C7D2FE;font-weight:600}
.hud3d .sr.fc span{color:#6EE7B7;font-weight:600}
.hud3d .sr.go{cursor:pointer}
.hud3d .sr.go:hover{background:rgba(34,211,238,.14);color:#fff}
.hud3d .sr.at{background:rgba(34,211,238,.2);color:#fff;box-shadow:inset 2px 0 0 #22D3EE}
.fig.fs .hud3d .stab{width:290px}.fig.fs .hud3d .sr{font-size:13px}.fig.fs .hud3d .sh{font-size:14px}